Mcalister Ranch Dam No 4
Mcalister Ranch Dam No 4 is a concrete dam located in Hays County, Texas, built in 1975. It carries a Significant hazard potential classification.
About Mcalister Ranch Dam No 4
The primary purpose of Mcalister Ranch Dam No 4 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Longhorn River Ranch Ltd (private). It impounds the Onion Creek.
The dam stands 17 feet tall, creates a reservoir covering 5 acres, has a maximum storage capacity of 56 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1975, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. An emergency action plan is in place for this dam. The most recent inspection on record was 03/31/2009. That was over 17 years ago.
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Location
| State | Texas |
| County | Hays |
| River/Stream | Onion Creek |
| Coordinates | 30.14760, -98.25331 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 17 ft |
| Dam Height | 17 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 56 acre-ft |
| Max Storage | 56 acre-ft |
| Normal Storage | 31 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 11,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | LONGHORN RIVER RANCH LTD |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Rated |
| Last Inspection | 03/31/2009 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | TX06568 |
| Federal ID | TX06568 |
| More Info | State Dam Safety Program |